Something sounds wrong.
Does this happen during the beginning of the next patrol just as you leave base or a save during patrol? Only thing I can think of is damage to engines or something else that would reduce speed. Usually when you load a save, the damage screen clears, but often damage is still there. If you had no damage before the save or know it's a new patrol, then sounds like that save is corrupted.
Also, try a new campaign patrol with it and see if you have any issues.
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